Reaction of trimethylene-bisadenine with d~(10) divalent cations

摘要

The synthesis, spectroscopic characterisation and X-ray structure determination of Ade_2(CH_2)_3 1, [(H-Ade)_2_3]Cl_2 centre dot H_2O 2 and the outer sphere complex [(H-Ade)_2(CH_2)_3]_2[Cd_2Cl_8(H_2O)_2] centre dot 4H_2O 3 are reported (Ade = adenine). An important change of conformation appears when trimethylene-bisadenine is protonated. The eclipsed and anti conformation between the two adenine moieties of 1 varies to a gauche and syn conformation for the corresponding Cl~- 2 and [Cd_2Cl_8(H_2O)_2]~(4-) 3 salts. Compound 3 presents a new dimeric [Cd_2Cl_8(H_2O)_2]~(4-) anion in which cadmium(II) has a distorted-octahedral co-ordination with two cis chlorine atoms bridging two cadmium atoms. The corresponding Zn(II) and Hg(II) salts have been obtained by similar procedures.